Piston ring



Nov. 10, 1931. E. A. KOETHER 1,830,841

PISTON RING Filed May 16 1930 7759515! .595 lad/w,

t Patented Nov. 10, I931 UNITED STATES.

EMIL A. KOETHER, OF BALTHIIORE, MARYLAND, ASSIGNOR TO 'I'EE AMERICANHAM- COMIANY, OF BALTIMORE, lLARYLAN-D,A CORPORATION OF MERED PISTONRING PATENT oF IE a PISTON BING- Applicatlon filed ,May 18, 1930. SerialNo. 458,025.

This invention pertains to piston rings and has reference moreparticularly to the production of a ring which by reason of its finish,or its periphery or wearing face, will quickly seat in.

Broadly stated the invention consists in producing. upon the wearingface of the ring a series of infinitesimal cris s-cross grooves whichhave the effect, when the ring is posi- 1 tioned, of permitting the oilto be immediately conducted across the wearing face of the ring as wellas around the ring. A rin with the crisscross finish herein shown andescribed therefore gives perfect lubrication and causes an oil film toinstantly form across the entire face of the ring.

The invention and several of the older methods of treating the outsideor wearin face of the ring are shown in the annexe drawings wherein:

Figure 1 is a perspective view of the finished ring embodying myinvention,

Figure 2 is a perspective View on an enlarged scale showing a fragmentof the ring to more clearly bring out the criss-cross infinitesimalgrooves,

Figure 3 is a face View of aring having an annular groove formed in itswearing face in addition to the small or infinitesimal. criss- 3 crossgrooves,

Figure 4 is a likeview in which the groove which extends around the ringstops short of the joint thereof,

Figure 5 is a transverse sectional view on vthe line VV of Figure 4,

Figure 6 is a face view of the working face of the section of a ring,which has been machine finished with the grooves which are necessarilyformed extending parallel to-the side faces of the ring,

Figure 7 is a like View showing the wearing face produced bya grinder,and

Figure 8 is a similar view seeking to show the wearing surface of alapped ring after the same has been seated in.

It is known that a ring which is provided with an annular grooveappearsto hold compression better than a ring without the annulargroove. I am therefore of the opinion that the annular groove holds asuflicient film produced in other manners but it will of oil to form anoil seal and prevent blowby. Such a ring, however, does not workperfectly until well seated. It has been found by actual test that bymeans of the criss-cross finish applied to a ring in accordance with myinvention, which ring may have an annular groove, the necessary oil sealis immediagely formed and blow-by is at once prevent- In the drawings 1denotes a split ring,the

outer wearing face orperiphery 2 whereof is provided with a series ofinfinitesimal grooves or channels preferably extending in t position onthe arbor. The rings are rough and are finish turned on the periphery.

' While still on the arbor the criss-cross finish is produced. This iseffected by placing the arbor in a lathe running at a slow speed and anabrasive block ofvery fine rade carborundum is then moved back and orthlengthwise of the arbor and over and in contact with the rings. I

In Figure 3 asection of a split ring is shown w1th the criss-crossfinish and an annular groove of channel 3 which extends entirely around.

In Figures 4 and MM ring is provided with a oove or channel 4 whichstops short of the sp it joint formed in the ring.

The finish, as above set forth, ma be renoted that it differs from' theordinary finishes as shown in Figures 6 and 7.

In Figure 6 the ring is subjected toa tuming action and as a consequencea series of grooves are formed about the same and sub stantiallyparallel to the side walls of the ring. a

In Figure 7 it is sought to show a surface which is produced by theaction of a grinder.

In Figure 8 the ring surface is shown in a series of infinitesimalgrooves extending across its face parallel to the axis of the ring. Sucha surface will inhere after a lapped ring has been seated in by use. Infact any piston ring will, after it has been in use for a time, 5present a surface similar to that shown 1n Figure 8. I

With the finish shown in Figure 6 it will be appreciated that the oilwill be impeded in its progress across the face'of the ring. The same istrue with the structure as shown in Figure 7 in which there is a seriesof inter rupted grooves extending circumferentially of the ring.Consequently these two structures will not act with the oil to properlylubricate the parts when the ring is first placed in position.

A ring produced with the above described one side at least of saidgroove and the adjacent edge of the ring, said 1nfimtes1mal groovesextending from the ring edge to the adjacent edge of the groove.

6. As a new article of manufacture, a PIS- ton rin having upon itsworking face a series 0 infinitesimal criss-cross grooves.

In testimony whereof I have signed my name to this specification.

- EMIL A. KOETHER.

finish upon its wearing face will, as above noted, readily seat in andby reason of the fact that the oil can pass from one edge to the otherthe parts are thoroughly lubricated and oil is present in a quantitysuificient to prevent blow-bye; Of course after the ring 25 has worn orbeen seated in, these diagonal or ability willadisa ppear and the ringwhen examined will present a wearing surface simcriss-cross grooves may,and in all probthe criss-cross' infinitesimal grooves with the essary oressential to the broad underlying invention. It will be appreciated, ofcourse,

in any manner or by any method;

What is claimed is:

that the criss-cross grooves'may be formed 1. As a new article ofmanufacture, a piston ring having its peripheral face provided with aseries of criss-cross grooves extending from edge to edge of the ring.

2. As a newv article of manufacture, a piston ring having a series ofintersecting grooves formedtupon the wearing face of the ring, saidgrooves extending in a direction angular to tlieaxis of the ring andextending entirely across the face thereof.

3. As a new article of manufacture. a piston ring having a series ofinfinitesimal grooves on its wearing face, said grooves extendingentirely across said face and in a direction angular to the axis of thering. I

4. As a new article of manufacture, a pis-.

